Medgar Evers College Department of Biology Course Number: Bio 461 Test 2 Total t
ID: 184124 • Letter: M
Question
Medgar Evers College Department of Biology Course Number: Bio 461 Test 2 Total time: 60 min nswer all questions. Please enter your results in scantron paper provided by using a pencil. aximum allowed time: 60 minutes. 1. The following statement describes the best about the nature of eukaryotic DNA: A) Consists of DNA and RNA B) Have a uniform diameter of 20 nm C) The protein-DNA complex D) The histone and non-histone proteins 2. In a nucleosome, the DNA is wrapped around positively charged: A) polymerase molecules B) ribosomes C) mRNA D) histones E) nucleolus protein 3. Which of the following statements concerning the eukaryotic chromosome is false? A) It is composed of DNA and protein. B) The nucleosome is the most basic structural subunit. C) Active transcription occurs on euchromatin. D) It consists of a single linear molecule of double-stranded DNA. E) The number of genes on each chromosome is different in different cell types. 4. If a cell were unable to produce histone proteins, which of the following would be expected to occur? A) There would be an increase in the amount of "satellite" DNA produced during centrifugation. B) Spindle fibers would not form during prophase. C) The cell's DNA couldn't be packed into its nucleus. D) Amplification of other genes would compensate for the lack of histones. E) Pscudogenes would be transcribed to compensate for the decreased protein in the cell. 5 The following statement is true about alternative splicing of a primary transcript (RNA). A) take place only in cancer cells. B) Transcription of alternative takes place by RNA polymerase. C) DNA and RNA polymerase alternate to complete transcription. takes place in prokaryotes and eukaryotes.Explanation / Answer
1. Eukaryotic nucleus cotains chromosome which complexed with histone proteins.
Hence, the right answer is option (C)- The protein DNA complex
2. Histones are the proteins which packed the DNA and maitains the structural unit called nucleosomes.
Hence, the right answer is option (D)- Histones
3. The right answer is option (E)- The number of genes on each chromosomes is different in different cell types
4. The right answer is option (C)- The cell's DNA could not be packed into its nucleus